Duplexing sized high temperature resisting aluminium based composite material enhanced by granules of ceramics

A technology of aluminum-based composite materials and ceramic particles, applied in the field of metal materials, can solve the problems of reducing tensile strength, limiting the application of composite materials, and limiting wide application.

Inactive Publication Date: 2006-07-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The in-situ grown aluminum carbide dispersed particle dispersion-strengthened aluminum composite material prepared by mechanical alloying has good high-temperature strength and thermal stability, and can be used to prepare some parts that serve under high-temperature conditions. However, the elastic modulus of this material is only 70MPa ( Comparable to the aluminum substrate), to a certain extent, limits its wide application in the industrial field
On the other hand, aluminum matrix composites reinforced with ceramic particles and whiskers are considered to be promising engineering structural materials due to their high strength and modulus. However, above 200 °C, due to the softening of the aluminum matrix, The tensile strength of discontinuously reinforced aluminum matrix composites decreases sharply, which limits the application of such composites under high temperature conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 10vol.% silicon carbide and 11vol.% aluminum carbide composite reinforced aluminum composite material manufacturing process: high-energy ball milling of aluminum and graphite powder with a weight ratio of 97:3 for 1.5 hours, heat treatment at 600°C for 1 hour, and then mixed with 10vol.% of 10 The micron silicon carbide particles were ball milled for 1 hour, and the mixed powder after ball milling was cold-pressed under high pressure to form a billet with a density of 90%, and the cold-pressed billet was extruded at 420° C. with an extrusion ratio of 25:1. The room temperature tensile strength of the obtained material is 458MPa, the room temperature elastic modulus is 90GPa, the tensile strength at 300°C is 246MPa, and the creep rate is about 1×10 under the applied stress of 100MPa at 450°C. -7 the s -1 .

Embodiment 2

[0016] 10vol.% silicon carbide and 7.4vol.% aluminum carbide composite strengthened aluminum composite material manufacturing process: high-energy ball milling of aluminum and graphite powder with a weight ratio of 98:2 for 2 hours, heat treatment at 600°C for 1.5 hours, and then mixed with 10vol.% The 10-micron silicon carbide particles were ball-milled for 1 hour, and the mixed powder after ball-milling was cold-pressed under high pressure into a billet with a density of 92%, and the cold-pressed billet was extruded at 430° C. with an extrusion ratio of 20:1. The room temperature tensile strength of the obtained material is 377MPa, and its creep rate is about 3×10 under the applied stress of 100MPa at 350℃. -9 the s -1 .

Embodiment 3

[0020] 10vol.% silicon carbide and 3.7vol.% aluminum carbide composite strengthened aluminum composite material manufacturing process: high-energy ball milling of aluminum and graphite powder with a weight ratio of 99:1 for 2 hours, heat treatment at 600°C for 1 hour, and then mixed with 10vol.% The 10-micron silicon carbide particles were ball-milled for 1.5 hours, and the mixed powder after ball-milling was cold-pressed under high pressure into a billet with a density of 95%, and the cold-pressed billet was extruded at 420° C. with an extrusion ratio of 30:1. The room temperature tensile strength of the obtained material is 322MPa, the tensile strength at 300°C is 138MPa, and the creep rate is about 1×10 under the applied stress of 80MPa at 350°C. -7 the s -1 .

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Abstract

This invention relates to a double-size ceramic particle reinforced Al-based high temperature resistant composite. It has characteristics of comprising of carborundum particles, in-situ formed acerate dispersed Al4C3 particles and Al matrix. Dispersed Al4C3 particles possess a volume fraction of 3.7~14.8% and are 0.01~0.05ª–m in diameter and 0.1~0.4ª–m in length while carborundum particles possess a volume fraction of 5~25% and are 3.5~15ª–m in size. For preparation aluminium and graphite powders are high-energy ball milled for 1~3 hours, thermal processed at 550~650 deg.C for 1~2 hours and then high-energy ball milled with carborundum powders for 0.5~2 hours. The mixed powders are cold compressed into billet with an 85~95% theoretical density and then molded by extrusion. The composite material has a high strength, modulus and excellent high-temperature performances and is thus applicable in the fields requiring certain high-temperature properties.

Description

Technical field: [0001] The invention relates to metal materials, and in particular provides a high-temperature-resistant aluminum-based composite material reinforced by double-sized ceramic particles. Background technique: [0002] The in-situ grown aluminum carbide dispersed particle dispersion-strengthened aluminum composite material prepared by mechanical alloying has good high-temperature strength and thermal stability, and can be used to prepare some parts that serve under high-temperature conditions. However, the elastic modulus of this material is only 70MPa ( Comparable to the aluminum substrate), to a certain extent, limits its wide application in the industrial field. On the other hand, aluminum matrix composites reinforced with ceramic particles and whiskers are considered to be promising engineering structural materials due to their high strength and modulus. However, above 200 °C, due to the softening of the aluminum matrix, The tensile strength of discontinuo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/06C22C47/14
Inventor 马宗义毕敬
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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